Maintenance Calorie Calculator

Maintenance Calorie Calculator: Find the Exact Intake That Holds Your Weight Steady

TL;DR: Maintenance calories are the precise number of calories your body burns across an entire day, including rest, digestion, and all movement. Most adults fall between 1,700 and 3,100 kcal per day at maintenance, depending on size and activity. This calculator multiplies your Mifflin-St Jeor BMR by a validated activity factor (PAL) to give you your personal daily target: the number that produces zero net weight change.

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Table of Contents

• The Baseline You Are Already Eating Around
• Seven Situations Where Knowing Your Maintenance Number Changes Everything
• How Maintenance Calories Are Calculated: BMR, PAL, and TDEE Explained
• Six Steps to an Accurate Maintenance Calorie Result
• See the Numbers Run: Two Worked Calculations
• Where People Go Wrong with Maintenance Calorie Estimates
• FAQ
• Assumptions and Notes
• Your Next Step After Getting the Number
• Further Reading

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The Baseline You Are Already Eating Around

Most people are already eating somewhere near their maintenance calories. They just do not know the number. And not knowing means that any attempt to lose fat, gain muscle, or simply stop gaining weight is based on guesswork rather than an established reference point.

Maintenance calories are defined as the total daily energy expenditure (TDEE) at a stable body weight: the number of calories that, consumed consistently, produces no net change on the scale. They encompass basal metabolic rate (the energy your organs burn at rest), the thermic effect of food (roughly 10% of calorie intake), and all deliberate movement. The mechanism is straightforward: consume above this number and body mass increases; consume below and it decreases.

The figure changes as body weight, age, and activity level change. A 5 kg fat loss reduces maintenance calories by 50–100 kcal. An increase from sedentary to moderately active can raise them by 350–500 kcal. Neither shift is visible without a calculation.

Enter your details above and the calculator returns your personal maintenance figure in seconds.

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Seven Situations Where Knowing Your Maintenance Number Changes Everything

• You have been eating "healthily" for months without losing weight and cannot identify why. If your intuitive intake is at or slightly above maintenance, the deficit you believe you are running does not exist. A maintenance calorie calculation often reveals that someone eating 1,900 kcal of clean food has a TDEE of 1,950 kcal — a 50 kcal theoretical surplus that, compounded over 52 weeks, produces approximately 0.7 kg of gradual weight gain.

• You have just finished a fat loss phase and want to reverse diet without regaining. After an extended deficit, TDEE is suppressed by 5–10% due to metabolic adaptation and reduced lean mass. Re-entering current weight and a moderate activity level gives the true new maintenance figure, which is typically 150–300 kcal below the maintenance calculated before the diet began.

• You are building muscle and want a lean surplus rather than a dirty bulk. The maintenance calorie number is the baseline from which a 250–300 kcal surplus is added. Without knowing maintenance precisely, people routinely overshoot by 200–400 kcal and accumulate more fat than intended during a muscle-building phase.

• You changed jobs and your daily activity level shifted significantly. Moving from a physical job to a desk job can reduce daily TDEE by 300–500 kcal without any change in formal exercise. If eating habits carry over from the more active period, a 400 kcal daily surplus accumulates to approximately 4 kg of fat gain over 10 weeks.

• You are returning to training after an injury layoff of 4 or more weeks. Four weeks of immobility reduces muscle mass by approximately 5–8% and drops the activity multiplier from moderately or very active to sedentary. Recalculating maintenance at the reduced weight and activity level prevents accidentally eating at a surplus while the body is not yet burning at the previous rate.

• You are a parent with a newborn and your sleep and movement patterns have changed radically. Disrupted sleep reduces non-exercise activity thermogenesis (NEAT) by up to 20%, reducing maintenance calories by 200–350 kcal per day compared to pre-newborn activity levels. Updating the maintenance figure to reflect the new lifestyle prevents unexpected slow weight gain over the first 6–12 months.

• You are coaching someone and need to explain why the same calorie target produces different results in two clients of the same weight. A 70 kg woman aged 28 with a moderately active lifestyle has a maintenance of approximately 2,170 kcal; a 70 kg woman aged 52 at the same activity level maintains at approximately 1,970 kcal. The 200 kcal gap is entirely attributable to age-related muscle loss, and showing the calculation builds trust in the programme design.

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How Maintenance Calories Are Calculated: BMR, PAL, and TDEE Explained

Your maintenance calorie target is your TDEE: BMR scaled up by a physical activity level (PAL) multiplier. Here is the full calculation chain.

Step 1 — Mifflin-St Jeor BMR:
  Male:   BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
  Female: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161

Step 2 — Apply activity multiplier:
  Maintenance calories (TDEE) = BMR × PAL

Physical Activity Level (PAL) Reference

Maintenance Calories by Activity Level (Female, 35 years, 165 cm, 65 kg)

The difference between sedentary and moderately active at this profile is 499 kcal per day. That gap is larger than many people's entire intended calorie deficit, which explains why choosing the wrong PAL level silently cancels out a diet plan.

Individual variation matters here. Twin studies show that resting metabolic rate can differ by up to 15% between people of identical height, weight, age, and sex. Part of this is driven by thyroid hormone activity, mitochondrial efficiency, and sympathetic nervous system tone. The PAL multipliers above are population averages validated across many studies; any individual's true maintenance may sit 100–200 kcal above or below the formula output.

The formula assumes stable body composition. Someone losing muscle while gaining fat at the same total weight will see their true maintenance creep downward even though the formula's output remains unchanged. This is why tracking outcomes over 3–4 weeks is as important as the initial calculation.

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Six Steps to an Accurate Maintenance Calorie Result

1. Weigh yourself on the same day of the week, first thing in the morning, after using the bathroom. Daily weight fluctuates by 1–2 kg due to hydration, glycogen, and meal timing. A single inconsistent weigh-in can shift the BMR result by 10–20 kcal and the final maintenance figure by 12–25 kcal. Use a 7-day average if the number feels variable.

2. Measure height barefoot and enter it accurately. A 2 cm height error shifts BMR by approximately 12 kcal and maintenance calories by 15–23 kcal depending on the PAL chosen. Not a large error in isolation, but worth removing.

3. Enter your age as of your last birthday. Every decade after 30 reduces BMR by approximately 50 kcal at stable weight, reflecting muscle mass loss of 0.5–1% per year. The formula handles this automatically via the age variable.

4. Select the PAL level that reflects your average week, not your best week. If last week included an unusually active long weekend, do not let it pull you to a higher multiplier. Think about the median week across the past month. When in doubt, select one level lower than feels right.

5. Read your maintenance calorie output and record it. This is the number that, eaten consistently, holds your weight stable. Do not immediately subtract a deficit or add a surplus before taking a moment to compare it to what you have been eating. The gap between current intake and maintenance often reveals why results have or have not been occurring.

6. Set a recalculation date 6–8 weeks from today. Maintenance calories change as weight, muscle mass, and activity level change. A 5 kg reduction in body weight drops maintenance by approximately 50–100 kcal. A training volume increase from lightly active to moderately active raises it by approximately 250 kcal. Neither update happens automatically.

Non-obvious insight: The maintenance calorie figure from this calculator is a weekly average target, not a daily requirement. Daily intake naturally varies by 200–400 kcal based on hunger, social eating, and training days. What matters is that the 7-day average lands near the maintenance figure. Obsessing over single-day precision creates unnecessary stress and does not improve the accuracy of weight management.

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See the Numbers Run: Two Worked Calculations

Example 1: Retiree Restarting Activity, Male, Age 67

David retired last year, has been walking 45 minutes most days, and wants to stop the gradual 1–2 kg annual weight creep he has noticed over the past three years. He is 176 cm tall and weighs 84 kg.

BMR (Mifflin-St Jeor, male):
  = 10 × 84 + 6.25 × 176 − 5 × 67 + 5
  = 840 + 1100 − 335 + 5
  = 1,610 kcal

Maintenance calories:
  Activity level: Lightly Active (1.375) — daily walking, no formal training
  = 1,610 × 1.375 = 2,214 kcal

David's maintenance sits at 2,214 kcal. His actionable plan: track his current intake for 7 days without changing it. If the average comes in above 2,214 kcal, he has identified the source of the gradual gain. A modest reduction to 1,900–2,000 kcal daily produces a 200–300 kcal deficit, which at his age is sufficient for slow, muscle-sparing fat loss of approximately 0.2 kg per week.

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Example 2: College Student Preparing for a Body Composition Change, Female, Age 20

Priya is in her second year of university, trains at the campus gym 4 days per week with mixed cardio and strength work, and wants to reduce body fat before the summer. She is 162 cm and weighs 68 kg.

BMR (Mifflin-St Jeor, female):
  = 10 × 68 + 6.25 × 162 − 5 × 20 − 161
  = 680 + 1012.5 − 100 − 161
  = 1,431.5 kcal

Maintenance calories:
  Activity level: Moderately Active (1.550) — gym 4 days per week
  = 1,431.5 × 1.550 = 2,219 kcal

Priya's maintenance is 2,219 kcal, almost identical to David's despite different ages, heights, and weights, because her lower BMR is offset by her higher activity multiplier. Her fat loss target: 1,719–1,919 kcal daily (300–500 kcal deficit), with a protein intake of 115–130 g to preserve muscle during the cut. She should recalculate after every 3–4 kg of weight reduction, as each drop reduces her maintenance by roughly 30–60 kcal.

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Where People Go Wrong with Maintenance Calorie Estimates

Selecting a PAL level based on how active they feel, not how active they are. Subjective activity perception runs high. Most people who train 3 times per week identify as "very active" (PAL 1.725) when the evidence-based match is "moderately active" (1.550). The difference on a 1,500 kcal BMR is 263 kcal per day. Over a week, this phantom 263 kcal difference is large enough to explain a plateau that has lasted months.

Recalculating maintenance using a goal weight instead of current weight. The formula outputs maintenance for the body you have today. Entering a target weight 10 kg below current weight reduces the BMR estimate by approximately 100 kcal and produces a maintenance figure that is 140–190 kcal too low. The practical result: the diet feels harder than it should, and the deficit is larger than intended, accelerating muscle loss alongside fat.

Treating the maintenance calorie output as fixed for an entire year. Body weight, lean mass, and activity level all shift over months. A person who loses 8 kg over 20 weeks of dieting has reduced their maintenance by approximately 80–160 kcal from the original calculation. Eating at the original maintenance figure for the final weeks of the diet inadvertently erases the deficit and stalls progress without any change in visible behaviour.

Forgetting to account for occupational activity when using the PAL table. A nurse, teacher, or construction worker who does not formally "exercise" is not sedentary. Standing and walking occupationally for 6–8 hours burns 300–500 kcal more than desk work. These occupations match "very active" or "extra active" on the PAL scale regardless of gym attendance. Misclassifying as sedentary produces a maintenance estimate 400–700 kcal too low.

Using the maintenance calorie figure from before a significant weight change. Losing or gaining 5+ kg changes the BMR by 50–100 kcal, which shifts the maintenance figure by 60–190 kcal depending on PAL. Most people who calculated maintenance once at the start of a diet and never updated are running on a figure that no longer matches their body. Recalculating every 4–6 weeks takes 60 seconds and prevents this drift.

Eating at maintenance immediately after a long deficit without accounting for metabolic adaptation. After 12 or more weeks of a sustained deficit, the body's actual maintenance is typically 5–10% below what the formula predicts, due to reduced NEAT, lower body weight, and adaptive thermogenesis. Jumping straight from a deficit to the full formula-calculated maintenance can produce 0.3–0.5 kg of weight gain per week in the first 2–3 weeks. A reverse diet approach, increasing intake by 50–100 kcal per week, avoids this rebound while allowing metabolism to recover.

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Assumptions and Notes

• Margin of error: The Mifflin-St Jeor formula predicts measured TDEE within 10% for approximately 80% of healthy adults. For the remaining 20%, including those with thyroid disorders, significant obesity, or body compositions far from the population average, the estimate may diverge by 10–20%. If tracked intake at the calculated maintenance produces a consistent net weight change after 3–4 weeks of accurate logging, adjust the figure by 100–150 kcal in the direction the scale indicates.
• Professional disclaimer: The maintenance calorie estimates produced by this calculator are based on validated population equations and are intended as a planning reference. They do not constitute nutritional or medical advice. People with eating disorder history, metabolic health conditions, or medically supervised dietary plans should work with a registered dietitian before applying any calorie target from this calculator.

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Your Next Step After Getting the Number

David's calculation revealed that his gradual annual weight creep had a concrete source: an intake that sat a few hundred calories above his true maintenance of 2,214 kcal. Priya's calculation gave her a specific fat loss target range with a protein floor, not a rough guess. Both results came from the same five inputs.

The number itself takes seconds. What comes after is the week of honest tracking that confirms whether the formula matches your reality, and the recalculation reminder that keeps it accurate as your body changes.

Run the calculator above, record your maintenance figure, and compare it to your tracked intake this week.

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Further Reading

• Calorie and TDEE Calculator: Apply an Activity Multiplier to Build Your Fat Loss or Muscle Gain Target
• BMR Calculator: Isolate Your Resting Calorie Burn Across Three Validated Formulas
• Calorie Deficit Calculator: Estimate How Long Your Fat Loss Phase Will Take at Your Current Maintenance